The Vertical Distribution of Ciliophora and Nematoda in the Sediments of Loch Leven, Kinross

1974 ◽  
Vol 74 ◽  
pp. 265-273
Author(s):  
Victoria M. T. Bryant ◽  
Johanna E. M. Laybourn
Keyword(s):  
Species Composition ◽  
Vertical Distribution ◽  
Sampling Period ◽  
The Other ◽  
Loch Leven ◽  
Ciliate Species ◽  
The Vertical Distribution

SynopsisThe species composition of ciliates and nematodes in the mud of Loch Leven was investigated: 59 species of Ciliophora and 14 species of Nematoda were recorded. The ciliate species composition varied widely throughout the 11-month sampling period, whereas that of the nematodes was more constant.The vertical distribution of ciliates and nematodes at four sites is described and related to the findings of other workers. Two distinct patterns of vertical distribution occurred, one typical of ciliates, the other of nematodes.

scholarly journals Seasonal variation in the vertical distribution of zone over Oakshin Gangotri, Antarctica

MAUSAM ◽  
2021 ◽  
Vol 42 (3) ◽  
pp. 275-278
Author(s):  
A.L. KOPPAR ◽  
S.C. NAGRATH
Keyword(s):  
Seasonal Variation ◽  
Vertical Distribution ◽  
Early Spring ◽  
The Other ◽  
Late Winter ◽  
Double Peak ◽  
The Vertical Distribution

Ozone soundings made from Dakshin Gangotri, Antarctica during 1987 are presented. The vertical distribution of ozone over Antarctica is characterised by a double peak profile, one around 200-150 hPa and the other around 50 hPa. During late winter-early spring the upper peak is considerably depleted. Tropospheric ozoe remains low and nearly constant throughout the year.  

Vertical distribution of forms of potassium in major soil series of Tamil Nadu

2003 ◽  
Vol 51 (3) ◽  
pp. 339-346 ◽  
Author(s):  
S. Natarajan ◽  
A. Renukadevi
Keyword(s):  
Organic Carbon ◽  
Vertical Distribution ◽  
Tamil Nadu ◽  
Water Soluble ◽  
The Other ◽  
Soil Series ◽  
Exchangeable K ◽  
The Relationship ◽  
The Vertical Distribution ◽  
Total Potassium

Fifteen major soil series at the rate of three for each soil group, namely red non-calcareous, red calcareous, black calcareous, brown calcareous and alluvial soils, were studied for the vertical distribution of different forms of potassium. The total potassium content varied from 515-5513 ppm and generally increased with depth. It was positively related with clay, silt, CaCO3, CEC and total Ca. Non-exchangeable K ranged from 340-1326 ppm and did not exhibit any uniformity in its distribution in soil profiles. The exchangeable K varied from 45-684 ppm and was positively related to organic carbon. NH4OAc-K ranged from 15-298 ppm. Soil properties like clay, silt, CaCO3 and organic matter were positively related to available K. Water-soluble K varied from 2-33 ppm and was found to decrease with the depth of the soil profile. It was positively correlated with organic carbon and negatively related to clay plus silt. Studies on the relationship between the above forms of potassium indicate that, except for total K, the other forms were closely related, indicating the possibility of predicting one from the other.

SPIDERS (ARANEAE) IN CORN FIELDS IN QUEBEC

1988 ◽  
Vol 120 (2) ◽  
pp. 97-100 ◽  
Author(s):  
Louis Provencher ◽  
Daniel Coderre ◽  
Charles D. Dondale
Keyword(s):  
Species Composition ◽  
Vertical Distribution ◽  
Dominant Species ◽  
Spider Species ◽  
Vertical Distributions ◽  
Corn Fields ◽  
Corn Plants ◽  
Web Building ◽  
The Vertical Distribution

AbstractThe purpose of this study was to determine spider species composition and their temporal and vertical distributions in corn in southern Quebec. We sampled 30 corn plants weekly for 12 weeks from 9 July to 23 September in 1985. We found nine families, 14 genera, and 12 identifiable species. Web-building spiders were more abundant than hunting spiders. The dominant species was Tetragnatha laboriosa Hentz (Tetragnathidae). Web-builders were generally found under the ear of the plant, whereas the vertical distribution of hunting spiders was more even.

scholarly journals Seasonal variation of the crustacean fauna in the belowground and aboveground strata in a Halodule wrightii meadow of northeastern Brazil

2017 ◽  
Vol 107 (0) ◽  
Author(s):  
Kcrishna V. S. Barros ◽  
Jesser F. Souza-Filho ◽  
Ricardo J. C. Paiva ◽  
Catarina L. Araújo-Silva ◽  
Alexandre O. Almeida ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Seasonal Variation ◽  
Vertical Distribution ◽  
The Other ◽  
Northeastern Brazil ◽  
Halodule Wrightii ◽  
The Vertical Distribution

ABSTRACT The different microhabitats provided by seagrasses and the habit of the species determinate the vertical distribution of crustaceans. This study verified the influence of the seasonality on the spatial distribution of the crustacean community associated with a Halodule wrightii meadow. From April 2006 to July 2007, we performed fifteen samplings in Goiabeiras Beach, Ceará State, each with five sectioned replicates in belowground and aboveground. Cumaceans and the amphipod Hyale media (Dana, 1853) had a higher frequency, density, and dominance than the other taxa, in both strata. The community exhibited gradual changes along the study, in both the belowground and aboveground strata, but the seagrass structure was not sufficient to explain the vertical distribution of the crustacean fauna along the time.

scholarly journals Assembly history modulates vertical root distribution in a grassland experiment

2021 ◽  
Author(s):  
Inés M. Alonso-Crespo ◽  
Emanuela W.A. Weidlich ◽  
Vicky M. Temperton ◽  
Benjamin M. Delory
Keyword(s):  
Vertical Distribution ◽  
Functional Groups ◽  
Plant Communities ◽  
Functional Group ◽  
Species Level ◽  
The Other ◽  
Priority Effects ◽  
Rooting Depth ◽  
Distribution Of Roots ◽  
The Vertical Distribution

The order of arrival of plant species during assembly can affect the structure and functioning of grassland communities. These so-called priority effects have been extensively studied aboveground, but we still do not know how they affect the vertical distribution of roots in the soil and the rooting depth of plant communities. To test this hypothesis, we manipulated the order of arrival of three plant functional groups (forbs, grasses and legumes) in a rhizobox experiment. Priority effects were created by sowing one functional group 10 days before the other two. Rhizoboxes in which all functional groups were sown simultaneously were used as controls. During the experiment, the mean rooting depth of plant communities was monitored using image analysis and a new methodological approach using deep learning (RootPainter) for root segmentation. At harvest, we measured aboveground (community and species level) and belowground (community level) biomass, and assessed the vertical distribution of the root biomass in different soil layers. At the community level, all scenarios where one functional group was sown before the other two had similar shoot and root productivity. At the species level, two forbs (Achillea millefolium and Centaurea jacea) benefited from arriving early, and one legume (Trifolium pratense) had a disadvantage when it was sown after the grasses. Priority effect treatments also affected the vertical distribution of roots. When grasses were sown first, plant communities rooted more shallowly than when forbs or legumes were sown first,. In addition, roots moved down the soil profile 24% more slowly in grasses-first communities. Our results highlight that plant functional group order of arrival in grassland communities can affect the vertical distribution of roots in the soil and this may have implications for species coexistence.

Ciliated Protozoan Fauna in the Forestomach of Dromedary Camels (Camelus dromedarius) in Libya

Zootaxa ◽  
2018 ◽  
Vol 4434 (3) ◽  
pp. 429
Author(s):  
GÖZDE GÜRELLİ ◽  
ASEM RAMADAN AMAR MOHAMED
Keyword(s):  
Species Composition ◽  
The Other ◽  
Camelus Dromedarius ◽  
Ciliated Protozoa ◽  
Ciliated Protozoan ◽  
Dromedary Camels ◽  
Low Frequencies ◽  
Ciliate Species ◽  
The Mean ◽  
Species Composition And Distribution

Species composition and distribution of ciliated protozoa obtained from the forestomach of 20 dromedary camels living in Zawiya, Libya were examined. Nineteen species and 10 morphotypes belonging to eight genera were identified. The mean number of ciliates was 54.2 ± 32.9 × 104 cells ml−1 in the forestomach contents, and the mean number of ciliate species per host was 6.5 ± 2.9. Entodinium and Epidinium were the main genera, as these ciliates were found consistently at higher proportions than those of the other genera. In contrast, Ophryoscolex and Polyplastron were only observed at low frequencies. Diplodinium rangiferi, Entodinium ellipsoideum, E. simulans, and Polyplastron multivesiculatum were new endosymbionts recorded from camels. 

The vertical distribution and succession of phytoplankton in the western English Channel in 1975 and 1976

1977 ◽  
Vol 57 (4) ◽  
pp. 1075-1093 ◽  
Author(s):  
P. M. Holligan ◽  
D. S. Harbour
Keyword(s):  
Species Composition ◽  
Vertical Distribution ◽  
Chlorophyll A ◽  
Growth Rates ◽  
Marine Environments ◽  
English Channel ◽  
Nutrient Requirements ◽  
Ecological Implications ◽  
The Vertical Distribution

The development of sensitive fluorimetric techniques for continuous in vivo measurements of chlorophyll ‘a’ (Lorenzen, 1966) has made it possible to study in detail the vertical distribution of phytoplankton in lakes and seas (e.g. Strickland, 1970; Berman & Pollingher, 1974; Lasker, 1975; Fasham & Pugh, 1976; Pingree et al. 1976). However, for marine environments there is little compatible data, such as given by Lasker (1977), on the species composition of localized phytoplankton populations. This is an important gap in our knowledge since the variations shown by different algal taxa in attributes such as nutrient requirements, growth rates, adaption to light, and palatability to zooplankton have wide ecological implications.

Peculiarities of composition and vertical distribution of centric diatoms in the Klyuchik Lake (Nizhny Novgorod Region)

2019 ◽  
pp. 55-59
Author(s):  
Alexander G. Okhapkin ◽  
Ekaterina L. Vodeneeva ◽  
Sergei I. Genkal ◽  
Pavel V. Kulizin ◽  
Kristina О. Skameykina
Keyword(s):  
Species Composition ◽  
Vertical Distribution ◽  
Centric Diatom ◽  
Diatom Algae ◽  
Hydrochemical Parameters ◽  
Centric Diatoms ◽  
Abundance Indices ◽  
The Vertical Distribution ◽  
Total Species ◽  
Nizhny Novgorod Region

The composition and development of phytoplankton of highly mineralized Lake Klyuchik (Nizhny Novgorod Region) were considered. The lake is unique of having a distinct ecotone on hydrochemical parameters. The prevalence of diatom algae, which are dominant in the number of species (46% of the total species composition) and abundance indices, was revealed. The vertical distribution of algae development was the most heterogeneous in the ecotone zone. In the bottom layers of the ecotone there was a mass development of the centric diatom Cyclotella distinguenda Hustedt with uniquely high abundance (several ten million cells/l) and biomass (more than 130 g/m3).

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